About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments III
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| Presentation Title |
Effects of Precipitate-Forming Species and Grain Refinement on the Microstructural Evolution of Neutron-Irradiated CrFeMnNi and CrFeMnNiTiAl Compositionally Complex Alloys |
| Author(s) |
Nathan Curtis, Sohail Shah, Kaustubh Bawane, Tiankai Yao, Mukesh Bachhav, Haiming Wen, Adrien Couet |
| On-Site Speaker (Planned) |
Nathan Curtis |
| Abstract Scope |
Compositionally complex alloys (CCAs) have been proposed for advanced structural nuclear applications due to reports of enhanced irradiation tolerance compared to dilute alloys. However, results from a CrFeMnNi CCA neutron-irradiated up to 6.7 displacements per atom (dpa) at 579 °C displayed signs of phase decomposition, which may serve to worsen structural performance and irradiation tolerance over time. To further explore CCA design for advanced nuclear reactor environments, the effects of grain refinement (via high pressure torsion) and precipitation strengthening (with Ti,Al-rich L12 precipitates) on the neutron-irradiation response of the CrFeMnNi(TiAl) system were explored at 6.7 dpa and 579 °C. Results display significant phase decomposition in nanocrystalline CrFeMnNi and CrFeMnNiTiAl with no surviving L12 in the latter alloy, and multiple precipitate phases were observed in the coarse-grained CrFeMnNiTiAl. Transmission electron microscopy and atom probe tomography techniques were employed to characterize irradiation-induced defects and chemical ordering in both systems. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Nuclear Materials, Environmental Effects |